Molecular stabilization of chemically exfoliated bare MnPS₃ layers

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Two-dimensional (2D) materials, including transition metal chalcogenophosphates (MPX3), offer tunable properties at the nanoscale.
• Mechanical exfoliation is common for obtaining 2D materials, but scalable methods are limited.
• Manganese phosphorus trisulfide (MnPS3) is a promising 2D material with potential applications.

Purpose of the Study:

• To develop a scalable chemical exfoliation protocol for MnPS3.
• To investigate the role of capping agents in stabilizing exfoliated MnPS3 flakes.
• To evaluate the electrocatalytic performance of functionalized MnPS3 for the hydrogen evolution reaction (HER).

Main Methods:

• Chemical intercalation followed by liquid-phase exfoliation of MnPS3.
• Functionalization of exfoliated MnPS3 layers using capping agents (e.g., polyethylenimine).
• Characterization of exfoliated MnPS3 flake quality and stability in aqueous solution.
• Electrochemical testing for HER activity.

Main Results:

• A general chemical protocol successfully exfoliated MnPS3 into 2D layers.
• Different capping agents influenced the quality and aqueous stability of MnPS3 flakes.
• Polyethylenimine as a capping agent yielded a balance between MnPS3 flake stability and HER electrocatalytic performance.
• Demonstrated the potential of functionalized MnPS3 for electrochemical applications.

Conclusions:

• Scalable chemical exfoliation of MnPS3 is achievable using intercalation and liquid-phase methods.
• Capping agents are crucial for stabilizing 2D MnPS3 in solution and tuning its properties.
• Functionalized MnPS3 shows promise as an efficient electrocatalyst for HER, particularly when using polyethylenimine.